What is the function of capacitor in tube-light?
A tube light consists of a filament & a choke or inductor for the lightening purpose. So, when supply is given to it, we can see a delay in its switching action. This is due to the choke. An inductor doesnt allows sudden change in its current; so after some time it glows. So, a capacitor is connected in parallel with thius circuit. This gives two advantages:
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How Does the Condenser in a Fluorescent Lamp Work?
When the voltage increases, the condenser absorbs a little of it. That means that there is a slight delay before the voltage gets through the circuit, pushing it back into phase with the amperage. When the voltage drops again, the condenser spits a little bit of stored voltage back out. That creates a slight delay before the voltage drops, again syncing it up with the amperage. The role of the ballast is not glamorous, but it is important. If it is not precisely calculated, the circuit can waste a lot of power.
Starters – Fluorescent
If you are experiencing any of the following problems with your fluorescent tubes then this page will tell you how to fix them, including information on what has likely caused the problem and how to check your starters and ballasts:
A starter is, as its name suggests, the element which "starts" a fluorescent tube. It is basically just a switch that opens and closes automatically until the fluorescent tube lights. There are two different types of starters out there, one based on an electrical switch and the other on a mechanical switch. A glow starter is a mechanical switch. It consists of a capacitor parallel to a glow lamp made of a bimetal strip (this combination makes an automatically opening and closing switch).
fluorescent lamp starter’s capacitor
• For maximum tube life replace the starter at the same time as the fluorescent tube
• Ensure the power is turned off before replacing the tube and starter
Appendix D: Ballast and Starter Tests
1. Install a known good lamp.
2. If the lamp lights normally, you have corrected the cause of the problem.
3. If the lamp does not light, and all previous checks do not reveal any circuit problem, replace the ballast. Normal operation should resume. To ensure proper performance, also replace the capacitor.
The starter is located on the lamp frame (there are typically two starters). When you turn on the light switch, the starter sends a jolt of electricity to the gas inside the fluorescent bulb. The ionized gas then conducts electricity and the bulb lights. When the starter stops working, the bulbs will either keep flickering without lighting or will only glow in the ends. (Flickering can also indicate the bulb needs replacing, but try the less expensive starter first.)